Cast truck-bolster.



Y. MIYASAKL CAST TRUCK BOLSTER.

APPLICATION FILED FE!3.15,1915.

Patented Oct. 12, 1915.

R O T N w. m/

WITNESSE w. \X.

Y E N R O T T A STATES PA ones;

YU'sKE M'iYiQsAiiI; OF MdKEEsR ooKs, PENNSYLVANIA.

CAST TRUGK BOLsTER.

Specification of Letters Patent. Pateifljed'flbt, 12, 1915.

Ab iittisiffiiea February 1511915. Serial 1%. 21267.

s it' knowfithat YUsKiih lIYAsA iifii subject of the Emperoi (if Japanyresiumg at McKes Rocks,- inf the eo'unty otAL leg-fishy aiiclstate-df Pennsylvania; have invented ceith'iii: ew mat eem mpiave:

gre ates't resistance "to t tiftical and li dii'z oi'it'al' seam yfmaihainmg t ethemes at e various parts of theloolste f heaflyiunitoriii;

such" ufiifofiiiity tliickfii feducin gfha bility of latent defects iii the casting of the bolster to aiiiiixiintiifil g The iii eiitio'n has foif a fin-they object to provide a cast ti liolstei therein usual vertical longitudinally extending Web is eliminated; but; \i ith'ou't recliihing" the strength of the bfo'lst ef. 1 g

It-isstill another objetit; of the invention to pi'idi id'e' cast ti'uck bolster embodying integrally coiiii ectecl Spacecl'p'aiisof longi f with cleiieiitiihg flanges, Whei'ehy a maxi lniiin resistance in the bolstefi construction to horiz ntal s't -ai'ns; isobtamedg Theinveritloii hasioi" a fufthe'r object to produce cast holster ha ing ifnp'i'oyed WVith the above and other o'bjectsf View, my invention con's'ist s'fiii theiioy'el features of coii'sti'uctihn, c'oi'iihin atioii, and arrangement of parts to be'liei'einafte ore fully described, c'laiihe'cl; and illustr'atecl' iii the ac'coiripanyin di awing, in which,

Figure 1 is a' top plan view of a cast cai" bols'tei constructed in accordance With the" presentinveiition'; Fig. 2 is a side elevation thereof; Fig. 3 is a central vertical section taken on the line 33 of Fig. 1; and Fig. %l: is a sectiontakenon the line H of Fig. 2. v Referfingin detail to the drawing, 5 and 6 designate the two longitudinally elxtend ihg top chord'niembei's of the bolster, which are integrally connected at intervals afceiitra'l longitudinally extending Weld 7 a'iitl'the spaced braces 8 Which are integrally formed with the" opposite faces of said Web and the opposed faces of the chord members aa ade, v

9; antl 10 clesigiiate the upper and ltivte'r' bottoinchofcl members which are also in: t'egi ally doniie' c t ecl to' each other in sljaced relation iii isiiiiilii manner to the chord iiierlriiber's' 5' andG; The lower chord 6 of the ii 'iije pair is'ofappfeciably less "width than upjier'rii'ost choi d'memloer 6i compression platef'fi and gradually tapers from the den-- tei 'of the holstei" to the ends of said chord rh en he f tig atwyliich points, it is integrally coimec-fedto theopifio'site ends the lower chorclj neihber 9 as shown at l1. s

ittl'ieiropposit'e ends, the top and bottom cho 'clmeinbei'sj Sand 10 are integrally clonne'ctedtdg'ethei by the vertical Walls 12. The'out'enfacesof these Vertical Wallshaye the usual beaiii engaging ribs 13 formed the i ebn aii'clthe extended ends of the upper clihicl ineniloer 5 are provided With bearings 11': and spring seats 15, in the usual manner;

The uppei aiicl loWer' pairs of longitudi n'ally" eiite'ndihg chord members are" integrallycon'riected and'bl'aced to resist vefti cal sti'ains, by a central tubular ti'uss 16. The-conl'pfession plate or top" chord meat beiffi centrally fo -inecl with an upwardly projecting tubular boss 17 to receive the cen' te-r pin, and a concentrically related standing flange 18 is'also formed upon said compression plate. The cliametei" of this fia'rig'e is preferably, although not necessarily, equal to the maximum idth of the compressionplate 5, While the vertical cylih d'ritial truss 16'is of somewhat less diametei'; although it is Within theconteinplated pui poseoi" theiiivention to'also make this truss 'o'fa diameter equal to the compression plate 5. The central portion of the coinpi'essiori' plate is effectively reinforced by means of a plurality of; longitudinally exteiitling bracing Webs 19 which integrally connect the bottom face ofsaicl coinpres sion plate" With the vertical Wall of the tubular truss 16. This central tubular truss is cast integrally at its ends with the upper and lower longitudinal chord members 5 and 10, while the chord members 6 and 9, at the center of the bolster, merge into and form an integral part of the wall of said truss. By the provision of the annular upstanding fiange 18 which extends across the entire width of the compression plate 5, the bearing portion of said plate is effectively reinforced, and by providing a central truss of the same diameter through its length, and without a taper, the proper coring of the same is greatly expedited. The bearing area of the vertical truss upon the bottom chord members is also increased. The coring of the truss is further simplified by extending the bracing flanges l9 longitudinally of the bolster instead of radially.

lit will be noted, from the above description, that the usual vertical longitudinally extending web between the upper and lower chord members of the bolster is eliminated. The metal which would be used in the proision of such webs is employed in increasing the width and thickness of the upper and lower pairs of chord members, so that the thickness of said members will be more nearly equal to the thickness of the other parts of the bolster construction. In this connection, it will be noted that the upper longitudinally extending chord member or compression plate 5 is of the greatest width, and the longitudinal edges of this compres sion plate 5 have depending flanges 20 formed thereon, the ends of said flanges be ing integral with the vertical side walls 12 of the bolster. These flanges 20 preferably extend downwardly for a short distance below the plane of the bottom face of the longitudinal chord member 6, said flanges being spaced from the central cylindrical truss 16 but connected to said truss by the integral bracing webs 21. By providing the chord members 0 and 9 Without the longitudinally extending connecting web, greater sectionmodulus is obtained. both vertically and horizontally of the bolster, from the use of an equal amount of metal. In a bolster having the central longitudinally extending web, said web is, to a great, extent, close to the neutral axis of the bolster and is less effective in obtaining a maximum sectionmodulus than is the case when the same amount of metal to be used in such a Web, is concentrated in the chord members 6 and 9, at a remote distance from the neutral axis, as shown in the accompanying drawing. If the metal heretofore used in forming the central web in the bolster is used in forming the chord members 5 and 10, the Width of which is limited, the strength of the bolster or its resistance to vertical strains, will be increased; but there will also be greater liability of latent defects in the casting of the bolster,'and more particularly in these chord members which are of greater thickness than the other parts of the bolster. In order to avoid this and also obtain greater resistance to horizontal pressures and bending strains, the flanges 20, above referred to, are formed on the upper chord member 5. These flanges are more effective in increasing the section-modulus of the bolster horizontally than any other parts thereof and with the use of a relatively small amount of metal. An increase in the width of the li'anges 2O beyond that necessary to produce the desired strength in the horizontal plane of the bolster in order that greater Vertical strength may be obtained, is less economical than the increase in the thickness of the metal in the chord members 6 and 9, as the additional quantity of metal in the flanges 20 will be much nearer to the neutral axis than the metal in the members 6 and 9. The increase in thickness of the flanges 20 for the purpose of obtaining greater vertical strength, also increases liability of latent de fects in the casting of the bolster at the junctures between the several parts thereof. Therefore, by the provision of the chord members 6 and 9, in combination with the longitudinal flanges 20 on the chord member or compression plate 5, a most economical construction is obtained and one which will offer a maximum resistance to vertical and horizontal strains, whereby the bolster may withstand the bending or bufling stresses to which it is subjected. Such a construction contains greater inherent strength than abolster having a central vertical longitudinally extending web, by reason of the fact that the thickness of all parts of the bolster is more nearly uniform and it is a generally recognized fact that the most effective means of eliminating defects in thebolster incident to shrinkage strains, is to reduce the difierence in thickness of the metal in various parts of the bolster as much as possible.

In order that the requisite strength in bolsters to be employed upon large capacity cars may be obtained, the bottom chord member 10 of such bolster must be increased in width, but such an increase in the width of this chord member is impractical as it would interfere with parts of the truck. In such cases, I, therefore, also form on the longitudinal edges of the chord member 10 the upwardly projecting flanges 22, shown in dotted lines in Fig. 4, said flanges extending slightly above the plane of the upper face of the chord member 9. t I

From the foregoing description, taken in 9 connection with the accompanying drawing,

the, manner of construction, as well as the several advantages of my improved truck bolster, will be clearly and fully understood. It will be seen that T have obtained, in a sin gleinteg-ralcasting, a construction of the bolster wherein the usual vertical web is eliminated while a maximum of strength and rigidity in the various parts of the bolster is obtained, and the same is enabled to withstand greater stresses than is the case with bolsters of the vertical web type, now in common use. My improved bolster may also be economically manufactured and may be employed upon rolling stock used for various purposes.

It is to be distinctly understood that, in carrying out my invention, changes in the form and proportion of the several parts of the bolster may be necessitated owing to the gnirticular exigencies incident to its use and I, therefore, reserve thejprivilege of resorting to all such legitimate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

Having thus fully described my invention, what I desire to claim and secure by Letters Patent is r i 1. A cast truck bolster including spaced longitudinally extending members, one of said members being provided upon its edges with longitudinally extending flanges projecting beyond the corresponding edges of the other chord member and in opposed relation thereto.

2. A cast truck bolster including spaced parallel longitudinally extending chord members, one of said members having flanges formed on its longitudinal edges extending toward the other chord member and beyond said member in spaced relation to the longitudinal edges thereof.

3. A cast truck bolster consisting of upper and lower pairs of longitudinal chord members integrally connected together at the center of the bolster, the top and bottom chord members being integrally con nected to each other at their ends, and separate integral connections between the opposed upper and lower chord members at the ends thereof, the space between the integrally connected ends of the latter chord members and the central vertical truss of the bolster being unobstructed.

A cast truck bolster consisting of upper and lower pairs of chord members, a central vertical truss integrally connecting said chord members to each other, the opposed chord members in the upper and lower pairs being integrally connected together at their extremities but unconnected between such terminal connections and the central vertical truss of the bolster, and vertically disposed flanges formed upon the longitudinal edges of one of the upper chord members.

5. A cast truck bolster consisting of upper and lower pairs of longitudinal chord members integrally connected at their ends, a central vertical truss integrally connecting the chord members to each other, the opposed chord members in the upper and parallel chord lower pairs being spaced apart to provide unobstructed longitudinally extending openings-through the bolster between said vertical truss and the ends of said chord members, and vertically disposed longitudinally extendingiianges formed upon the edges of the upp'erinostchord member. v

6. A cast truck bolster-consisting of upper and lower pairs oflongitudinal chord members integrally connected together at their ends, a hollow vertical truss integrally connecting the chord members to each other at the center of the bolster, the opposed cord members of the upper and lower pairs being spaced apart from their extremities to said central truss to provide longitudinally extending openings in the bolster, and depending'flanges formed on the longitudinal edges of the uppermost chord member. 1

. 7. A cast truck bolster consisting of upper and lower pairs of longitudinal chord members integrally connected together at their ends, a hollow vertical truss integrally connecting the chord members to each other at the center of the bolster, the opposed chord members of the upper and lower pairs being spaced apart from their extremities to said central truss to provide longitudinally extending openings in the bolster, and depending flanges formed on, the longitudinal edges of the uppermost chord member, said flanges extending below the plane of the bottom face ofthelower chord member in the upper pair.

8. A cast truck bolster consisting of upper and lower pairs of longitudinal chord members integrally connected together at their ends, a hollow vertical truss integrally connecting the upper and lower chord members together at the center of the bolster, the

opposed chord members in the upper and lower pairs being spaced apart between their extremities and said truss to provide longitudinal openings in the bolster, the uppermost chord member being provided with depend: ing flanges on its longitudinal edges, the

walls of the truss, said chord members and said flanges being of substantially uniform thickness.

9. A cast truck bolster consisting of upper and lower pairs of longitudinally extending chord members integrally connected together at the opposite ends of the bolster and a hollow vertical truss of uniform diameter throughout its length integrally connecting the chord members at the center of the bolster, and of a diameter approximately equal to the maximum width of the opposed upper and lower chord members.

10. A cast truck bolster consisting of upper and lower pairs of longitudinal chord members, the opposed individual upper and lower chord members being integrally connected together at their ends by vertically extending webs, and a central longitudinal :web extending between the chord members in each pair and beyond said vertical webs to the opposite extremities of the bolster said latter web connecting the top and bottom chord members together beyond the ends of the other chord member.

11. A cast truck bolster consisting of upper and lower pairs of longitudinal chord members, the members in each pair being integrally connected to each other and the opposed upper and lower chord members being integrally connected together at their eX- tremities, integral connections between the top and bottom chord members at the ends or" the bolster, a central hollow vertical truss integrally connecting the upper and lower pairs of chord members, and longitudinally extending flanges formed upon the edges of the top chord member and depending below the plane of the bottom face of the lower chord member in the upper pair.

12. A cast truck bolster consisting of upper and lower pairs of longitudinal chord members, the opposed upper and lower members being integrally connected together at their ends, integral connections between the top and bottom chord members at the'ends of the bolster, a hollow verticaltruss integrally connecting the upper and lower chord members at the center of the bolster, and vertically disposed flanges formed upon the longitudinal edges of the top and bottom chord members, the opposed upper and lower chord members being spaced apart between their lntegrally connected ends and the central vertical truss to produce longitudinally extending openings in the bolster.

In testimony whereof I hereunto aiiix my signature 1n the presence of two witnesses.

YUSKE MIYASAKL Witnesses ROBERT Lowny, P. E. LAMBERT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

